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Now that there's no longer a WKBasedNavigationManagerImpl, this
CL merges WKBasedNavigationManagerTests into NavigationManagerTests.

Bug: 738020
Change-Id: I0ca38967d64ef8ebade2d808413b478b04c1bf56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2581461Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836333}